Orthoptic training device



KR: ammmsga r April Filed April 25, 19s;

a. SHAMSKY ORTHOPTIC TRAINING DEVICE 4 Sheets-Sheet 1 B. SHAMSKY ORTHOPTIC TRAINING DEVICE April 27, 1954 Filed April 25, 1950 4 Sheets-Sheet 2 mmzsmaammamna JNVENTOR.

awn/v 5mm April 27, 1954 Filed April 25, 1950 B. SHAMSKY ORTHOPTIC TRAINING DEVICE 4 Sheets-Sheet 4 Patented Apr. 27, 1954 @FFHQE ORTHOPTIC TRAINKNG DEVICE Burton Shamsky, Berkeley, Calif.

Application April 25, 1950, Serial No. 157,930

4 Claims.

This invention relates to picture. projecting equipment for the orthoptic training of patients and in general has for its object the provision of a projecting system whereby a beam of light emanating from a picture source is split into two distinct beams and whereby these two beams are oppositely polarized and then projected on a screen to be viewed by a patient wearing spectacles having oppositely polarized lenses. When the two frames are so viewed one will be seen only by one eye of the patient and the other by the remaining eye of the patient.

More specifically the object of this invention is the rovision of a light analyzer wherein a beam of light emanating from a conventional motion picture projector is split into two distinct beams, wherein the two resulting beams are oppositely polarized and wherein means is provided for selectively varying the directions of said two polarized beams of light relative to each other.

A further object of this invention is the provision of a. light analyzer of the character described wherein one of said beams of polarized light may be made continuously to scan a predetermined scan area.

A still further object of this invention is the provision of a light analyzer of the character described provided with one or more light filters for selectively adjusting the intensity of said polarized beams relative to each other.

Another object of this invention is the provision of an analyzer of the character described provided with a shutter for sequentially intercepting said polarized beams of light so that the projected pictures resulting therefrom will be seen alternately b each eye of the patient.

By resorting to a light analyzer of this character a patient or group of patients may be subjected to orthoptic training while viewing an entertainin or educational moving picture film.

The invention possesses other advantageous features, some of which. with the foregoing, will be set forth at length in the following description where that form of the invention which has been selected for illustration in the drawings accompanying and. forming a art of the pres- Fig. 2 is an isometric projection of the light beam splitting, polariz ng and filtering assembly diagrammatically illustrated as the central element of Fig. 1.

Fig. 3 is a horizontal section taken on the section line 33 of Fig. 2.

Fig. i is a vertical fragmentary section taken on the section line l of Fig. 3.

Fig. 5 is a vertical fragmentary section taken on the section line 55 of Fig. 3.

Fig. 6 is a vertical section taken on the section line B8 of Fig. 3.

Fig. 7 is a horizontal fragmentary section taken on the section line 'I'! of Fig. 6.

Fig. 8 is a vertical fragmentary section taken on the section line 8-3 of Fig. 3.

As schematically shown in Fig. 1, the objects of my invention have been embodied in a system including a standard motion pictur projector generally designated by the reference numeral l, a conventional screen generally designated by the reference numeral 2, and a light analyzer disposed between the projector l and the screen 2 and generally designated by the reference numeral 3. Conventionally, the projector 1 includes a pair of reels 4 and 5 for the reception of a strip of film 6, means not shown being provided for actuating these reels, a light source 1 disposed behind the film and a condenser 8 located in front of the film.

The light analyzer 3 includes a casing 9 shown in dot-dash line and mounted within the casing is a half-silvered. mirror I l and a reflector 12. the mirror It being in the path of the beam of light emerging from the condenser 8 and makills: an angle of therewith so that a portion of this beam will pass directly through the mirror to form a frame 13 on the screen 2. A portion of the beam emanating from the condenser 3 is reflected at right angles by the halfsilvered mirror to the reflector 12 which in turn reflects it forwardly generally parallel to the first beam so as to form a frame M on the screen 2 laterally offset with respect to the frame 18. Disposed in the path of the beam {5 passing through the half-silvered mirror I! is a polarized transparency l6 and similarl disposed in the-path of the beam ll reflected by the reflector I2 is a polarized transparency 18, these two transnarencies being oppositely polarized as indicated by the shade lines thereon, and on the frames [3 and [4. Also located in the path of the beam 45 is a li ht filter Hi varying in density stepby step or progressively. Similarly disposed in the path of the beam I! is a similar light filter 2i.

fi t

By resorting to this system a beam of light passing through the condenser and characterized by the film split into two separate laterally offset and oppositely polarized beams result n in two late'ally offset and oppositely polarized on the screen 2. When viewing these frames through spectacles 22 provided with oppositely' polarized lenses 23 and a patient will see the frame [3 only through one eye and the other frame is only through the other eye, depending upon the-relative polarization of the lenses 23 and M with respect to the frames 13 and M.

The casing 21 includes forward and rear walls 25 and 2S. si.e walls 21 and 28, a top 29 and bottom 3!. lliounted on the rear wa l 26 is outwardly extending collar 32 in registration with an aperture 33 formed in the rear wall and arranged to be placed in axial alignment with the condenser 8 of the motion picture projector l. Screwed to the inner face of the front wall is an intermediate panel provided with a pair of vertical channels 35 and 36. Fastened to the face of the intermediate panel 3 is a plate 3" serving to close the channels 35 and Formed in the front wall. 25 and in the plate 3? are circular apertures 38 in axial alignment with the collar Similarly formed in the front wall 95 and in the plate 3? in horizontal alignment v th the apertures 33 are rectangular windows Dividing the analyzer 3 into upper and lower chambers ll and A2 is a horizontal part on 3-? fastened to the side walls 2'! and 2&3. Fastened to the partition 43 (see Figs. 3 and 5) is a channel l l disposed at an angle of approximately 45 with respect to the axis of the collar 32 and the aperture 33. Similarly fastened to the lower of the top 2% in alignment with the channel an angle 55. 'Seated within the id and resiliently held therein by a spring 35 is the halfsilvered mirror l forming one element of analyzer 3 schematically indicated l. Mounted in the angle 45 is a spring 38 engaging the upper end of the mirror l Mounted in the top 29 is a flanged bearing bushing ill and ,iournaled in this bushing is a pin Keyed to the lower end of the pin 5! is a cam 52 arranged to engage the rear face of the halfsilvered mirror -ll and to thereby determine the inclination of this mirror. Mounted on the top 29 a accnt the bushing as is a bushing 53 and journaled in this bushing is a round-headed stud E i. Fastened to to mesh with a gear 56akeyed to the pin Fixed to the upper end of the pin is a knurl button 55 for rotating the pin 51 and indire the gear 55. Also fixed to the stud 54 is a poi- 57 arranged to sweep over a suitably calibrated scale 53 fastened to the upper face of the top By restorting to this construction the ertical angularity of the half-silvered mirror H can determined without having to look: within the analyzer.

Mounted in the top 29 and in the partition ii: are vertically aligned bushings GI and G2 and journaled respectively in these bushings are 33 and E i. Fastened to the opposed ends of these pins is mirror frame 35 and mounted in th s frame is a mirror I2, spring clips 51 serving to sold the mirror in its proper position. For the purpose of adjusting the horizontal angularity of the mirror i2 there is fixed t0 the upper pin all bushing 13 mounted in the partition 4'. Fastenecl to the lower face of the top 2.? is a plate 14 serving to retain the gear 69 in place, the shaft ll being vertically movable with respect thereto. Fixed to the upper end of the pin "i! is a knurled button ?5 for imparting rotation to the gear $9 and through the gear 69 to the gear 63. Fastened to the upper end of the pin $3 is a pointer 16 arranged to sweep over a suitably calibrated scale ll fastened to the upper face of the top 29.

Secured to and depending from the partition 33 is a bracket 8% and pivoted to the lower end of this bracket is a rocker arm 82 provided with forked ends 83 and 84. Fixed to the lower end of the pin H is a collar 5 formed with an annular saddle 8? arranged to accommodate the fork B3. Formed intermediate the ends of the pin H are a pair of notches 8i and 88 arranged to selectively receive the free end of a spring 89 fastened to the partition :33. As a result of this construction it can be seen that by applying a downward force to the knurled button '15 the shaft Il may be moved downwardly until the detent 913 of the spring 89 is seated in the upper notch 87 and that as a result of the downward movement of the pin ii the fork 84 will simultaneously move upwardly. The lower end of the pin 64 is journaled in a bushing Si mounted in the bottom 3! of the analyzer. Keyed to the pin E l adjacent the fork 8 3 and slidable thereon is a sleeve 92 provided with an annular saddle 93 for the accommodation of the fork E5. Formed on the upper end of the sleeve 92 are diametrically opposed radial ribs or receivable, upon the upward movement of the sleeve 52, in complementary radial slots 95 formed in the hub 9E of a cam arm 9 The hub 58 is journaled to the pin 5 by a bushing 98 fixed to the hub 56. To prevent the downward movement of the hub 96 the shaft pin so is stepped at this point to form a shoulder for supporting the bushing S8 and consequently the hub which is afllxed thereto. Fastened to the free end of the cam lever Q? is a cam follower roller .Journaled in the partition 43 and bottom 35 respectively in bushings l0! and N12 is a shaft .73 (see Fig. 6) provided with opposed flat faces ifi l at its upper end. Fastened to the shaft [33 is a supporting disc #05 and seated on this disc is a circular cam plate lBS provided with a diametrically disposed slot id! for the accommodation of the shaft 563 at a point adjacent its fiat faces we. The width of the slot Hi? should be substantially that of the shaft H33 across its flatfaced portion so that the only movement of which the cam plate is capable is a diametrical movement relative to the shaft Hi3. For the purpose of locking the cam plate ltd in any predetermined position relative to the shaft M3 the supporting disc is provided with a slot Hi8 sub stantially parallel to the slot l3? and extending upwardly through this slot and threaded into the lower face of the cam plate his is a screw Hit. The shaft H33 and its associated circular cam plate 88 are so located relative to the cam follower roller 93 that the latter engages the outer pe iphery of the cam plate 166. Secureo t0 the cam arm 8! is a pin 5 l l and fastened to the lower end of this pin is one end of a coil spring ll'Z, the opposite end of the spring being fastened to a pin 313 secured to and extending downwardly fr m the partition 33. As a result of the above construction it will be seen that if the shaft 7! is depressed so that the detent fill is accommodated in the upper notch 8? the ribs 94 will seat in the grooves or slotllll to key the shaft 83 to the hub 96, this construction therefore serving as a clutch. As a consequence of the oscillatory movement imparted to the shaft 54 due to the movement of the cam follower roller in response to the eccentric rotation of the cam disc 1% the mirror will be caused to scan a predetermined scan area on the screen.

Mounted within the lower compartment 42 to the front wall 25 is an electric motor H5 including a drive shaft H55 and a power lead H7. Se cured to the inner end of the shaft 5 l 6 is a bevel gear H8 arranged to mes with the bevel gear l 19 fixed to the shaft H 3. Rotation of the shaft H6 will therefore impart rotation to the shaft I03 and to its associated eccentrically disposed circular cam disc Fastened to the wall between the apertures 38 and 39 is a flanged pin l2! (see Fig. 2) having a threaded outer end 122. Journaled on this pin by a bushing #23 is a circular light shutter I25 provided with a generally rectangular opening I25. Fastened to'the shutter PM in axial alignment with the pin 12! is a sprocket wheel :26 and threaded to the outer end of the pin is a knurled nut 12'! arranged to seat against the shoulder of the pin. Passing over the sprocket wheel 126 and a sprocket wheel i123 fixed to the shaft 1 i5 is a sprocket chain E23. As a result of this construction the shutter I24 is driven by the motor H5 which, as above indicated, also serves to drive the eccentrically disposed circular cam disc 86. The shutter i2 can of course be removed whenever desired by merely unscrewing the knurled nut l2? and disengaging the chain I29 from the sprocket wheel i28.

Accommodated within the analyzer channel 35 is the light filter l9, preferably formed of a number of separate transparent panels 432 of progrew sively increasing density. The outer edge of this filter is provided with perforations I33 for the accommodation of the teeth 34 of a sprocket I35, this sprocket 535 being fixed to the inner end of a pin lBE journaled in a bushing l3"! fastened to the side wall 28. Affixed to the outer end of the in is a knurled button 138 serving as means for determining the vertical position of the filter l6 relative to the circular aperture 38. Similarly disposed in the channel 36 is the filter 2i preferably of sectionalized construction and provided along its outer vertical edge with perforations 5 32 for the reception of the teeth of a sprocket 43. The sprocket 4 33 is fixed to a pin M journalcd in a bushing i155 mounted in the side wall 21. Aifixed to the outer end of the pin M6 is a knurled button Hi6 serving to control the vertical position of the filter 22 relative to the rectangular aperture 39.

From an inspection of Fig. 2 it will be noted that the shutter window F25 is of such dimensions as to encompass the rectangular aperture 39 as well as the circular aperture 38. Also as indicated in this figure the analyzer is provided with an onand-oil? switch l l'i arranged to be placed in circuit with the lead l i? and with a suitable source of electric power.

Clamped between the front wall 25 of the analyzer and the intermediate panel 34 in reg" istration with the aperture 38 is the polarized transparency H3 and similarly clamped betwee. the front wall 25 and the intermediate wall 35 in registration with the rectangular aperture 39 is the polarized transparency l8. As previously described, these transparencies are oppositely polarized to produce the oppositely polarized frames 23 and i l on the screen 2.

From this description it will be seen that the analyzer 3 serves as a means whereby a beam emanating from the condenser of a moving picture projector may be split into two separate beams of oppositely polarized light to form two independent oppositely polarized frames on the screen 2 and whereby the relative intensity of these two beams may be adjusted as desired by means of the filters l9 and 2!. To adjust the elevation of the frame hi it is merely necessary to tilt the half-silvered mirror H, this being accomplished by rotation of the knurled button 56. The lateral position of the frame 14 relative to the frame i3 may be adjusted by rotating the knurled button I5 through any determined angle as reflected by the pointer 16 thereby to cause a corresponding rotation of the mirror I2 on its vertical axis. When it is desired to cause the rnirror iii to scan a predetermined scan area to thereby cause the frame Hi to move laterally across the screen it is merely necessary to depress the button 15 to cause the notch Bl of the shaft 7| to be engaged by the detent of the spring 89. As previously explained, this results in a clutching action between the sleeve 92 and the hub 98 to thereby impart to the shaft 54 the oscillatory movement of the cam arm 91. Concurrently with this scanning action of the mirror (2 it is possible to have the shutter I24 continuously rotate so as to cause the frames 13 and M to be intermittently and alternately projected on the screen 2.

I claim:

1. An orthoptic training system comprising: a picture projector; a projector screen; and a light analyzer disposed between said projector and said screen; said analyzer including: a half-silvered mirror and a reflector arranged to receive a beam of light from said projector and to split said beam into two separate and laterally offset beams di rected toward said screen; oppositely polarized transparencies disposed in the path of said separated beams; a light shutter disposed in the path of each of said laterally oiiset beams wher by said oppositely polarized, laterally offset beams alternately produce polarized offset frames on said screen.

2. A light analyzer comprising: a casing provided with a light receiving aperture; first means mounted in said casing and including a halfsilvered mirror and a reflector operatively associated to split a beam of light entering said aperture into two separate and laterally offset beams; second means associated with said first means for continuously causing said reflector to oscillate through a predetermined angle; and a polarized transparency disposed in the path of each of said offset beams; said transparencies being oppositely polarized.

3. A device of the class described comprising: casing providing a light receiving aperture; first means mounted in said casing and including a half-silvered mirror and a reflector operatively associated to split a beam of light entering said aperture into two separate and laterally offset beams; second means associated with said first means i r continuously causing said reflector to oscillate through a predetermined angle; and a polarized transparency, disposed in the path of each of said offset beams: said transparencies being oppositely polarized; said second means including a clutch to enable inactivation of said reflector.

4. A device of the class described comprising: a casing providing a light receiving aperture; first means mounted in said casing and including a 7 half-silvered mirror and a reflector operativcly associated to split a beam of light entering said aperture into two separate and laterally offset beams; second means associated with said first means for continuously causing said reflector to oscillate through a predetermined angle; a polarized transparency disposed in the path of each of said offset beams; said transparencies being oppositely polarized; said second means including a clutch to enable inactivation of said reflector; and means for adjusting the angular position of the reflector relative to the mirror when the clutch is disengaged.

Name Date Ames, Jr Aug. 1'7, 1926 Number Number Number 15 230,120

Name Date Cubitt Feb. 24, 1931 Pettie May 16, 1933 Turville Nov. 5, 1935 Oakley Apr. 12, 1938 Rones Feb. 28, 1939 Manly Oct. 31, 1939 Briggs Sept. 3, 1940 Ames et a1. Apr. 15, 1941 Sherbinin May 12, 1942 Carnahan Nov. 10, 1942 Shepard Nov. 14, 1944 FOREIGN PATENTS Country Date Great Britain Mar. 9, 1925 

